Building boards and printing method used for the same

ABSTRACT

In a building board having a designed surface with pattern convex portions, and upper and lower shiplap portions, both of which are formed in the end portion of the designed surface, a printing extension portion is formed in the lower shiplap1 portion, and the printing extension portion is printed in such a way that the extension portion and the pattern convex portion are continuously formed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a building board, a designed surface ofwhich is printed, and a printing method used for the board.

2. Description of the Prior Art

A joint method by which building boards are jointed according to shiplapjoint will be explained, referring to FIG. 7 and FIG. 8. FIG. 7 is aperspective view showing a jointing state in which right and leftbuilding boards are jointed according to the joint method by shiplapjoint. As shown in the drawing, according to the joint method by shiplapjoint, a fastening member 72 is locked to lower shiplap portions both ofwhich are located over an abutting joint portion 71 formed with abuttingbuilding boards 100A and 100B, and the fastening member 72 is fixed on afurring strip 73 with nails.

FIG. 8 is a schematic sectional view showing a jointing state by shiplapjoint. As shown in the drawing, a jointing state by shiplap joint inwhich jointing of right and left building boards is realized by puttingthe upper shiplap portion 120B formed in the end portion of theleft-side of the building board 100B disposed on the right side on thelower shiplap portion 110A formed in the end portion of the right-sideof the building board 100A disposed on the left side. Moreover, acaulking compound 81 is provided to the lower shiplap portion 110Abeforehand, and is pressed by the upper shiplap portion 120B so as tofunction as a dam against rainwater which enters from the abutting jointportion 71. Accordingly, water is prevented from leaking to the backside (the inside of a house) of the building board after construction.

As all operations necessary for butt jointing in which a sealingmaterial is applied to an abutting joint portion are not required at allby the above-described shiplap jointing, the workability is increased,and, at the same time, the appearance after construction is greatlyimproved. Obviously, neither spoiling of the appearance due to secularchanges in the sealing material nor water leak based on deterioration ofthe material occurs.

FIG. 9A and FIG. 9B are views, each explaining a construction method ofbuilding boards as an external wall. When building boards 100A, 100B,and 100C, all of which have shiplap portion in every direction for thejoint method by shiplap joint, are fastened to an external wall as shownin FIG. 9A, the building board 100A disposed on the left side isfastened to a column (structural building frame) in the first place,and, then, the building board 100B disposed on the right side of theboard 100A is arranged in the jointing state by shiplap joint (a statein which the upper shiplap portion 120B formed in the left side of thebuilding board 100B is put on the lower shiplap portion 110A formed inthe right side of the building board 100A), and is fastened to thecolumn. Subsequently, the building board 100C disposed over the buildingboard 100A is arranged in the jointing state by shiplap joint (a statein which the upper shiplap portion 120C formed in the lower side of thebuilding board 100C is put on the lower shiplap portion 110A formed inthe upper-side of the building board 100A), and is fastened to thecolumn. A fastening member as shown in FIG. 7 is used for the fastening.

FIG. 9B is a view showing a state in which the three building boards100A, 100B, and 100C are jointed. The fastening members (not show in thedrawing) are fixed to the column for arranging the building boards.However, in the case where the fastening member is fixed to the columnat the upper end of abutting portion 72 between the two building boards100A and 100B respectively arranged on the right and left sides, thefastening member is fixed approximately horizontally to the column whilecorrecting pattern shifts between the right and left building boards andthe like.

A gap between the building boards in the abutting joint portion 71 willbe explained, referring to FIG. 10A and FIG. 10B. The designed surfacesof the building boards 100A and 100B include pattern convex portions101A and 101B, and joint portions 102A and 102B. FIG. 10A is a viewshowing a case in which the distance between the abutting two buildingboards in the abutting joint portion 71 is equal to a designed value.The pattern convex portions on the right and left building boards arephysically divided into parts in the abutting joint portion 71. However,when the patterns on the building boards are designed in such a way thata part of the pattern convex portion 101A on the building board 100Adisposed on the left side and a part of the pattern convex portion 101Bon the building board 100B disposed on the right side form one patternconvex portion, the pattern continuity between the right and leftbuilding boards may be secured in appearances.

FIG. 10B is a view showing a constructed state in which the distancebetween the two abutting building boards in the abutting portion 71becomes larger than the designed value, and the two building boards aremutually shifted by a distance DELTA d in an up and down direction,based on errors in the cutting size and the like. In this case, afeeling of pattern mismatching (a feeling of wrongness) is causedbecause the pattern continuity between the pattern convex portionscannot be secured in appearances as shown in FIG. 10A.

Incidentally, in order to secure the pattern continuity between theright and left building boards, it is required to consider how to colorboth of the pattern convex portions, other than how to continuously formboth of the pattern convex portions, which are physical shapes of thedesigned surfaces of the building boards, on the right and left buildingboards as described above. Japanese Patent Laid-Open No. 3284037 hasdisclosed a painting technology for coloring patterns as a method bywhich pattern continuity between abutting building boards is realized.

Generally, there is an apprehension that the width of a abutting jointportion formed between abutting building boards in a ceramics system (ina cement system) becomes different from a designed value when thebuilding board is used on the external wall of a building, because thebuilding board is by no means manufactured without dimensional errors.Accordingly, defective construction is caused, and pattern shiftsbetween right and left building boards is brought in appearances.Moreover, the width of an abutting joint portion is changed by secularchanges after construction, that is, by repeated expansion andcontraction of an building board in some cases to cause pattern shiftsbetween right and left building boards, and the appearance is largelyspoiled.

SUMMARY OF THE INVENTION

An object of the present invention is a configuration in which a feelingof wrongness is not caused by securing pattern continuity betweenpattern convex portions in appearances even when the widths of abuttingjoint portions formed between abutting building boards are differentfrom each other by defective construction and secular changes afterconstruction, and shape shifts between pattern convex portions arecaused.

According to the present invention, in a building board having adesigned surface with pattern convex portions, and upper and lowershiplap portions, both of which are formed in the end portion of thedesigned surface, a printing extension portion is printed in the lowershiplap portion in such a way that the extension portion and theabove-described pattern convex portion are continuously formed.

According to the present invention, a feeling of wrongness is not causedin appearances by securing pattern continuity between pattern convexportions of two abutting building boards even when the width of anabutting joint portion formed between the abutting building boards islarge, and a position shift between the boards is caused.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A through FIG. 1F are views, each showing an example of a printingextension portion of a lower shiplap portion on a building boardaccording to the present invention;

FIG. 2A through FIG. 2C are views, each showing an example of theprinting extension portion of the lower shiplap portion on the buildingboard according to the present invention;

FIG. 3A through FIG. 3D are views, each showing another example of theprinting extension portion of the lower shiplap portion on the buildingboard according to the present invention;

FIG. 4A and FIG. 4B are views, each showing a method by which image datafor the printing extension portion in the lower shiplap portion on thebuilding board according to the present invention is generated;

FIG. 5A and FIG. 5B are views, each showing a method by which image datafor the printing extension portion in the lower shiplap portion on thebuilding board according to the present invention is generated;

FIG. 6 is a view showing the details of the printing extension portionin the lower shiplap portion on the building board according to thepresent invention;

FIG. 7 is a perspective view showing a jointing state in which right andleft building boards are jointed according to a joint method by shiplapjoint;

FIG. 8 is a schematic sectional view showing a joint method by shiplapjoint;

FIG. 9A and FIG. 9B are views, each explaining a construction method ofbuilding boards as an external wall; and

FIG. 10A and FIG. 10B are views, each explaining an abutting jointportion between the building boards.

DETAILED DESCRIPTION OF THE INVENTION

Examples of a building board according to the present invention will beexplained, referring to FIG. 1A through FIG. 3D. According to thepresent example, a similar pattern and color to a part of the patternand color on a pattern convex portion 101A is printed on a lower shiplapportion 110A of a building board 100A. Here, a printed portion on thelower shiplap portion 110A is called a printing extension portion 10.When it is assumed that the length of the lower shiplap portion 110A,which is measured along the printing direction of the building board100A, is F, and the length of the printing extension portion 10 in theportion 110A is f, f≦F. It is also assumed that the width of the patternconvex portion 101A is H, and the width of the printing extensionportion 10 of the portion 110A is h.

In the example shown in FIG. 1A, the central axis of the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A coincides with that of the pattern convex portion 101A on thebuilding board 100A, and the both portions have the same width. That is,h=H. Accordingly, one edge of the printing extension portion 10 and thecorresponding one edge of the pattern convex portion 101A are on thesame straight line, and the other edge of the portion 10 and the otheredge of the portion 101A are on the same straight line.

FIG. 1B is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.1A. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted from the board 100A upward bya distance DELTA d. A pattern convex portion 101B of the building board100B on the right side is shifted by a distance DELTA d upward from theprinting extension portion 10 of the lower shiplap portion 110A on thebuilding board 100A on the left side. That is, in this example, theshift amount of DELTA d between the two building boards is exactly equalto the shift amount between the pattern convex portion 101B on thebuilding board 100B on the right side and the printing extension portion10 of the lower shiplap portion 110A in the building board 100A on theleft side.

In the example shown in FIG. 1C, the central axis of the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A coincides with that of the pattern convex portion 101A, butthe widths of the both portions are different from each other. That is,h>H. It is assumed that h=H+2p. One edge of the printing extensionportion 10 is shifted by a distance p outward from the correspondingedge of the pattern convex portion 101A, and the other edge of theportion 10 is shifted by a distance p outward from that of the portion101A. FIG. 1D is a view showing a state in which another building board100B is abutted to the right side of the building board 100A shown inFIG. 1C. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted from the board 100A upward bya distance DELTA d. The upper edge of the pattern convex portion 101B ofthe building board 100B on the right side is shifted by a DELTA d−p fromthe upper edge of the printing extension portion 10 of the lower shiplapportion 110A on the building board 100A on the left side. This shiftamount of DELTA d−p may become sufficiently small not to cause thefeeling of wrongness in appearances. However, the lower edge of thepattern convex portion 101B of the building board 100B on the right sideis shifted upward by a DELTA d+p from the lower edge of the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A on the left side. This shift amount of DELTA d+p may belarger than the shift amount of DELTA d between the two building boardsto cause the feeling of wrongness in appearances.

In the example shown in FIG. 1E, the central axis of the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A coincides with that of the pattern convex portion 101A, butthe widths of the both portions are different from each other. That is,h<H. It is assumed that h=H−2p. One edge of the printing extensionportion 10 is shifted inward by a distance p from the corresponding edgeof the pattern convex portion 101A, and the other edge of the portion 10is shifted by a distance p inward from that of the portion 101A. FIG. 1Fis a view showing a state in which another building board 100B isabutted to the right side of the building board 100A shown in FIG. 1E.In this case, it is assumed that the building board 100B on the rightside is arranged so as to be shifted from the board 100A upward by adistance DELTA d. The lower edge of the pattern convex portion 101B ofthe building board 100B on the right side is shifted upward by a DELTAd−p from the lower edge of the printing extension portion 10 of thelower shiplap portion 110A on the building board 100A on the left side.This shift amount of DELTA d−p may become sufficiently small not tocause the feeling of wrongness in appearances. However, the upper edgeof the pattern convex portion 101B of the building board 100B on theright side is shifted upward by a DELTA d+p from the upper edge of theprinting extension portion 10 of the lower shiplap portion 110A on thebuilding board 100A on the left side. This shift amount of DELTA d+p maybe larger than the shift amount of DELTA d between the two buildingboards to cause the feeling of wrongness in appearances.

In the example shown in FIG. 2A, the central axis of the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A is shifted by a distance p upward from that of the patternconvex portion 101A on the building board 100A, but the both portionshave the same width. That is, h=H. One edge of the printing extensionportion 10 is shifted upward by a distance p from the corresponding oneedge of the pattern convex portion 101A, and the other edge of theportion 10 is shifted by a distance p upward from the other edge of thepattern convex portion 101A.

FIG. 2B is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.2A. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted by a distance DELTA d upwardfrom the board 100A. One edge of the pattern convex portion 101B of thebuilding board 100B on the right side is shifted by a distance of DELTAd−p upward from the corresponding one edge of the printing extensionportion 10 of the lower shiplap portion 110A on the building board 100Aon the left side, and the other edge of the portion 101B is shifted by adistance of DELTA d−p upward from that of the printing extension portion10 of the portion 110A on the board 100A on the left side. This shiftamount of DELTA d−p may become sufficiently small not to cause thefeeling of wrongness in appearances.

FIG. 2C is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.2A. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted by a distance DELTA ddownward from the board 100A. One edge of the pattern convex portion101B of the building board 100B on the right side is shifted by adistance of DELTA d+p downward from the corresponding one edge of theprinting extension portion 10 of the lower shiplap portion 110A on thebuilding board 100A on the left side, and the other edge of the portion101B is shifted by a distance of DELTA d+p downward from that of theprinting extension portion 10 of the portion 110A on the board 100A onthe left side. This shift amount of DELTA d+p may become larger than theshift amount of DELTA d between the two building boards to have apossibility that the feeling of wrongness in appearances is caused.

Other examples of a building board according to the present inventionwill be explained, referring to FIG. 3A through FIG. 3D. According tothe present example, the lower shiplap portion 110A on the buildingboard 100A is printed as an extended part of the pattern convex portion101A as shown in FIG. 3A. Here, a printed portion on the lower shiplapportion 110A is called a printing extension portion 10. The printingextension portion 10 includes a center portion 11 having the samepattern and color as those of a part of the pattern convex portion 101A,and auxiliary portions 12 and 13 at the both sides. The brightness ofthe color of the auxiliary portion 12 and 13 are reduced to, forexample, half in that of the pattern convex portion.

When it is assumed that the length of the lower shiplap portion 110A,which is measured along the printing direction of the building board100A, is F, and the length of the printing extension portion 10 in theportion 110A is f, f≦F. It is also assumed that the width of the patternconvex portion 101A is H, and the width of the printing extensionportion 10 of the lower shiplap portion 110A is h. The width of theprinting extension portion 10 is H+p, that of the center portion 11 isH−p, and the width for each of the auxiliary portions 12 and 13 is p.The central axis of the printing extension portion 10 is shifted by adistance p/2 upward from that of the pattern convex portion 101A.

The upper edge of the printing extension portion 10, that is, the upperedge of the upper auxiliary portion 12 is shifted by a distance p upwardfrom the upper edge of the pattern convex portion 101A. The lower edgeof the printing extension portion 10, that is, the lower edge of thelower auxiliary portion 13 coincides with the lower edge of the patternconvex portion 101A. The lower edge of the center portion 11 is shiftedby a distance p upward from the lower edge of the pattern convex portion101A.

FIG. 3B is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.3A. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted by a distance DELTA d upwardfrom the board 100A. The upper edge of the pattern convex portion 101Bof the building board 100B on the right side is shifted by DELTA dupward from the upper edge of the center portion 11 in the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A on the left side. However, the auxiliary portion 12 isarranged between the upper edge of the pattern convex portion 100B ofthe building board 100B on the right side and the upper edge of thecenter portion 11 in the printing extension portion 10 of the buildingboard 100A on the left side. The upper edge of the pattern convexportion 101B of the building board 100B on the right side is shifted byDELTA d−p upward from the upper edge of the auxiliary portion 12 in theprinting extension portion 10 on the building board 100A on the leftside. This shift amount of DELTA d−p may become sufficiently small, and,moreover, the pattern convex portion 101B of the building board 100B andthe auxiliary portion 12 have the same hue and are different only intheir brightness so as to cause a state in which the brightness of theauxiliary portion 12 is slightly reduced for printing. Accordingly, ashadow effect by blurring is realized, and the feeling of wrongness inappearances is not caused. The lower edge of the pattern convex portion101B of the building board 100B on the right side is shifted by DELTAd−p upward from the lower edge of the center portion 11 in the printingextension portion 10 of the lower shiplap portion 110A on the buildingboard 100A on the left side. This shift amount of DELTA d−p may becomesufficiently small, and, moreover, the building board 100B and theauxiliary portion 13 have the same hue and are different only in theirbrightness so as to cause a state in which the brightness of theauxiliary portion 13 is slightly reduced for printing. Accordingly, ashadow effect by blurring is realized, and the feeling of wrongness inappearances is not caused.

FIG. 3C is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.3A. In this case, it is assumed that the building board 100B on theright side is arranged so as to be shifted by a distance DELTA ddownward from the board 100A. The upper edge of the pattern convexportion 101B of the building board 100B on the right side is shifted byDELTA d+p downward from the upper edge of the auxiliary portion 12 inthe printing extension portion 10 of the lower shiplap portion 110A onthe building board 100A on the left side, and by DELTA d downward fromthe upper edge of the center portion 11 in the printing extensionportion 10. The lower edge of the pattern convex portion 101B of thebuilding board 100B on the right side is shifted by DELTA d+p downwardfrom the lower edge of the center portion 11 in the printing extensionportion 10 of the lower shiplap portion 110A on the building board 100Aon the left side, and by DELTA d downward from the lower edge of theauxiliary portion 13 in the printing extension portion 10 of the lowershiplap portion 110A. As the shadow effect by blurring is similarlyrealized on the auxiliary portions 12 and 13, the feeling of wrongnesscaused by the shift amount of DELTA d is remarkably reduced incomparison with the case of FIG. 2C.

FIG. 3D is a view showing a state in which another building board 100Bis abutted to the right side of the building board 100A shown in FIG.3A. In this case, it is assumed that the central axis of the patternconvex portion 101B of the building board 100B on the right side isarranged so as to coincide with the central axis of the pattern convexportion 101A on the building board 100A on the left side. The upper edgeof the pattern convex portion 101B of the building board 100B on theright side is shifted by DELTA p downward from the upper edge of theauxiliary portion 12 in the printing extension portion 10 of the lowershiplap portion 110A on the building board 100A on the left side, butcoincides with the upper edge of the center portion 11 in the printingextension portion 10 of the lower shiplap portion 110A. The lower edgeof the pattern convex portion 101B of the building board 100B on theright side is shifted by DELTA p downward from the lower edge of thecenter portion 11 in the printing extension portion 10 of the lowershiplap portion 110A on the building board 100A on the left side, butcoincides with the lower edge of the auxiliary portion 13 in theprinting extension portion 10 of the lower shiplap portion 110A. As theshadow effect by blurring is similarly realized on the auxiliaryportions 12 and 13, the feeling of wrongness caused by the shift amountof DELTA p is remarkably reduced.

As the auxiliary portions have been provided at the both sides of thecenter portion in the printing extension portion of the lower shiplapportion in this example as described above, the feeling of wrongness inappearances caused by a shift amount by construction between abuttingbuilding boards is effectively reduced.

Subsequently, a method for printing a building board according to thepresent invention, more particularly, a method for printing a printingextension portion in a shiplap portion will be explained, referring toFIG. 4A through FIG. 5B. In this example, a pattern and a color for aprinting extension portion are made, using image processing software fora computer, and they are converted into print data, and are supplied toa printing device. Here, a method by which an image for a printingextension portion is made on a screen of a display device connected to acomputer will be explained. Here, the computer has stored image data forpatterns and colors of a pattern convex portion on an building boardbeforehand.

As shown in FIG. 4A, an image in a right end portion of the buildingboard 100A arranged on the left side, and an image in a left end portionof the building board 100B arranged on the right side are displayed on ascreen 400 of a display device. Then, the two images are jointed througha boundary line L-L as shown in FIG. 4B in such away that the patternconvex portion 101A on the building board 100A on the left sidecoincides with the pattern convex portion 101B on the building board100B on the right side. Subsequently, a portion 401 corresponding to apart within a range of, for example, 2 mm from the boundary line L-L iscut out from the pattern convex portion 101A on the building board 100Aon the left side, and a portion 402 corresponding to a part within arange of, for example, 1 mm from the boundary line L-L is cut out fromthe pattern convex portion 101B on the building board 100B on the rightside.

The reason that the cut portion 401 is largely cut out is that the lowershiplap portion 110A is an extended portion of the designed surface ofthe building board, and a centerpiece for extension printing of thepattern convex portion 101A. Moreover, the dimension of the cut portion402 is set shorter in order to prevent a state in which an influence onthe side of the pattern convex portion 101B cannot be neglected when thewidth of an abutting joint portion is extremely extended (though theprobability that the state is caused is low). Obviously, only the cutportion 401 may be cut out.

The two images 401 and 402, which have been cut out, are jointed asshown in FIG. 5A. As shown in FIG. 5B, added regions 403 and 404, eachof which has the same width as that of the rectangular image and aheight of p (for example, 1 mm), are respectively provided on and underrectangular images formed by jointing. Then, there is executed imageprocessing by which an image in the rectangular region with a width of pfrom the top of an image (401+402) is cut out and is pasted on the addedregion 403; an image in the rectangular region with a width of p fromthe bottom of the image (401+402) is cut out, and is pasted on the addedregion 404; and the brightness of each of the pasted images is reducedto half. Here, there is formed a composite image 405 which expresses theimage (401+402) expressing the extended part of the right end portion ofthe building board 100A and the extended part of the left end portion ofthe building board 100B; and the extended parts of the top and bottomend portions. The image in the printing extension portion, which hasbeen obtained above, is converted from a red green blue code into a cyanmagenta yellow black one, and, then, is supplied to the printing device.

FIG. 6 is a view showing the printing extension portion which has beenprinted according to the printing method which has been explained,referring to FIG. 5A and FIG. 5B. The printing extension portionincludes the center portion 11, and the auxiliary portions 12 and 13,and the center portion 11 includes a left side portion 111 and a rightside portion 112. The pattern and color of the left side portion 111 andthose of the image in a region with the same area in the abuttingpattern convex portion 101A are the same, and the pattern and color ofthe right side portion 112 and those of the image in a region with thesame area in the abutting pattern convex portion 101B are the same.

It will be appreciated by persons skilled in the art that the inventionis not limited to the above-described examples and various modificationsand applications may be made within the scope of the invention describedin the claims though examples according to the present invention havebeen explained above.

1. A building board having a designed surface with pattern convexportions, and upper and lower shiplap portions, both of which are formedin the end portion of said designed surface, wherein a printingextension portion is formed in said lower shiplap portion, and saidprinting extension portion is printed in such a way that said extensionportion and said pattern convex portion are continuously formed.
 2. Thebuilding board according to claim 1, wherein said printing extensionportion has the same width as that of said pattern convex portion, andhas the same pattern and color as those of a part of said pattern convexportion.
 3. The building board according to claim 1, wherein saidprinting extension portion has a center portion having the same patternand color as those of a part of said pattern convex portion andauxiliary portions at the both sides of said center portion, and thepattern and color for said auxiliary portions are the same as those of apart of said center portion.
 4. The building board according to claim 3,wherein the brightness of the pattern and color for said auxiliaryportions is lower than that of the pattern and color of said patternconvex portion.
 5. The building board according to claim 3, wherein saidcenter portion has a left side portion and a right side portion alongthe direction of axis line of said pattern convex portion, said leftside portion has the same pattern and color as those of a part of saidpattern convex portion, and said right side portion has the same patternand color as those of a part of a pattern convex portion on an abuttingbuilding board on the right side.
 6. The building board according toclaim 1, wherein said printing extension portion has a center portionhaving the same pattern and color as those of a part of said patternconvex portion and auxiliary portions at the both sides of said centerportion, and at least one of said auxiliary portions projects outwardfrom the edge of said pattern convex portion.
 7. A method for printing abuilding board, comprising; displaying, on a screen of a display deviceconnected to a computer, images of two right and left building boardswhich are arranged abutting to each other and each of which has adesigned surface with pattern convex portions, and upper and lowershiplap portions, both of which are formed in the end portion of saiddesigned surface; forming an image in a printing region on the screen ofsaid display device by cutting out a portion with a predetermined widthfrom said image in said pattern convex portion on said building board onthe left side, cutting out a portion with a predetermined width fromsaid image in said pattern convex portion on said building board on theright side, and joining said portions; and printing said image in saidprinting region in such a way that said lower shiplap portion on saidbuilding board and said pattern convex portion are continuously formedwhen said pattern convex portion on said building board is printed. 8.The method for printing a building board according to claim 7, whereinsaid forming an image in a printing region further includes jointingimages in printing regions which are extended to portions on and undersaid image in said jointed printing regions.